{"id":8120,"date":"2021-09-08T11:29:32","date_gmt":"2021-09-08T09:29:32","guid":{"rendered":"https:\/\/myoceane.fr\/?p=8120"},"modified":"2021-09-24T07:48:25","modified_gmt":"2021-09-24T05:48:25","slug":"hadoop-hdfs-data-integrity-with-checksum","status":"publish","type":"post","link":"https:\/\/myoceane.fr\/index.php\/hadoop-hdfs-data-integrity-with-checksum\/","title":{"rendered":"[Hadoop] Hdfs Data Integrity with Checksum"},"content":{"rendered":"<div id=\"fb-root\"><\/div>\n<p>\u4f7f\u7528 Spark\/Hadoop \u751f\u614b\u7cfb\u9019\u9ebc\u4e45\u4e4b\u5f8c\uff0c\u6700\u8fd1\u624d\u958b\u59cb\u4f86\u7814\u7a76 Hadoop \u7684 checksum \u6a5f\u5236\u662f\u600e\u9ebc\u904b\u4f5c\u7684\uff1f<\/p>\n<h4>\u4f7f\u7528 hdfs dfs \u6307\u4ee4\u624b\u52d5\u751f\u6210 Checksum <a href=\"https:\/\/community.cloudera.com\/t5\/Community-Articles\/Comparing-checksums-in-HDFS\/ta-p\/248617\">\u53c3\u8003\u6307\u4ee4<\/a><\/h4>\n<pre class=\"lang:bash\">hdfs dfs -checksum \/tmp\/hadoop-common-2.7.3.2.6.3.0-SNAPSHOT.jar\n\/tmp\/hadoop-common-2.7.3.2.6.3.0-SNAPSHOT.jar MD5-of-0MD5-of-512CRC32C  000002000000000000000000c16859d1d071c6b1ffc9c8557d4909f1<\/pre>\n<p style=\"text-align: justify;\">\u5728\u4f7f\u7528\u9019\u500b\u6307\u4ee4\u7684\u6642\u5019\u51fa\u73fe\u7684\u662f None\uff0c<a href=\"https:\/\/community.datafabric.hpe.com\/s\/question\/0D50L00006BIsZmSAL\/checksum-of-file-on-hdfs-returning-none\">\u53ef\u80fd\u53ef\u4ee5\u53c3\u8003\u7684\u539f\u56e0<\/a>\uff0c\u4e5f\u53ef\u80fd\u662f abfss \u4e0d\u652f\u63f4\uff0c\u4f46\u662f\u4f7f\u7528 file:\/\/\/ \u9084\u662f\u51fa\u73fe None\uff0c\u9019\u908a\u9084\u4e0d\u662f\u5f88\u4e86\u89e3\u539f\u56e0\u3002<\/p>\n<h4>\u76f4\u63a5\u4f7f\u7528 ChecksumFileSystem<\/h4>\n<p style=\"text-align: justify;\">\u5728\u5be6\u4f5c Checksum \u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 <a href=\"https:\/\/hadoop.apache.org\/docs\/current\/api\/org\/apache\/hadoop\/fs\/ChecksumFileSystem.html#ChecksumFileSystem-org.apache.hadoop.fs.FileSystem-\">ChecksumFileSystem \u9019\u500b\u985e\u5225<\/a>\uff0c\u7531\u65bc\u9019\u662f\u4e00\u500b abstract class \u6240\u4ee5\u6c92\u6709\u8fa6\u6cd5\u76f4\u63a5\u65b0\u589e\u4e00\u500b ChecksumFileSystem\uff0c\u4e00\u5b9a\u8981\u4f7f\u7528\u7e7c\u627f\uff0c\u4f8b\u5982\u4e0b\u9762\u6ab8\u6aac\u7238\u63d0\u4f9b\u4e00\u500b\u7528 Scala \u5beb\u7684\u7bc4\u4f8b\u3002<\/p>\n<pre class=\"lang:scala\">class NewFileSystem(fs: FileSystem) extends ChecksumFileSystem(fs) {\n  val name = \"NewFileSystem\"\n}\n\nobject SparkUtil {\n  def getHadoopFileSystem(path: String, conf: Configuration): NewFileSystem = {\n    val fs = FileSystem.get(new URI(path), conf)\n    new NewFileSystem(fs)\n  }\n}<\/pre>\n<p style=\"text-align: justify;\">\u6b64\u6642\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 ChecksumFileSystem \u88e1\u9762\u7684 copyFromLocal \u51fd\u5f0f\u5728\u4e0a\u50b3\u6a94\u6848\u7684\u6642\u5019\u5c31\u53ef\u4ee5\u4e00\u4f75\u7522\u751f\u5faa\u74b0\u6aa2\u67e5\u78bc crc (Cyclic Redundancy Check) \u8207\u4e0a\u50b3\uff0c\u6ab8\u6aac\u7238\u5be6\u6e2c\u7684\u7d50\u679c\u662f ChecksumFileSystem \u53ef\u4ee5\u81ea\u52d5\u751f\u6210\u4e00\u500b CRC32C \u7684\u3002\u503c\u5f97\u6ce8\u610f\u7684\u662f ChecksumFileSystem \u53ea\u80fd\u5920\u7522\u751f .crc \u7684\u6aa2\u67e5\u78bc\uff0c\u4e26\u7121\u6cd5\u66f4\u63db\u7522\u751f\u6aa2\u67e5\u78bc\u7684\u6f14\u7b97\u6cd5\u3002<\/p>\n<p>\u5099\u8a3b\uff1a<a href=\"https:\/\/medium.com\/@chenfelix\/crc32c-algorithm-79e0a7e33f61\">\u95dc\u65bc CRC32C \u7684\u6f14\u7b97\u6cd5<\/a><\/p>\n<h4>\u4f7f\u7528 FileSystem \u539f\u751f\u7684\u51fd\u5f0f getFileChecksum<\/h4>\n<p>\u5728\u4f7f\u7528 getFileChecksum \u7684\u6642\u5019\u53ef\u4ee5\u5229\u7528\u985e\u4f3c\u4ee5\u4e0b\u7684\u7a0b\u5f0f\u78bc\u76f4\u63a5\u7522\u751f\u4e00\u500b MD5MD5CRC32CastagnoliFileChecksum \u7684\u6aa2\u67e5\u78bc\uff0c\u6bd4\u8f03\u524d\u9762\u7684 CRC32C \u591a\u4e86 MD5 \u7684\u7de8\u78bc\u3002<\/p>\n<pre class=\"lang:bash\">val dfs = \"hdfs:\/\/localhost:9000\/test\/test.txt\"\nval fs = getHadoopFileSystem(dst, hadoopConf)\nval checksum = fs.getFileChecksum(new Path(dst))<\/pre>\n<p>\u4f46\u662f\u9019\u908a\u9084\u662f\u4e0d\u80fd\u5920\u66f4\u63db\u6210\u5176\u4ed6\u7684 Hash \u6f14\u7b97\u6cd5\u4f8b\u5982 SHA256\u3002\u5099\u8a3b\uff1a\u9019\u908a\u7684 FileSystem \u8981\u662f DistributedFileSystem \u624d\u80fd\u5920\u6210\u529f\u7522\u751f\u51fa\u6211\u5011\u8981\u7684 Checksum\u3002<a href=\"https:\/\/stackoverflow.com\/questions\/14563245\/hdfs-file-checksum\">\u53c3\u8003\u7db2\u5740<\/a><\/p>\n<h4>\u5617\u8a66\u66f4\u65b0\u7d44\u614b dfs.checksum.type \u5230 SHA256<\/h4>\n<p>\u53c3\u8003<a href=\"https:\/\/www.mail-archive.com\/issues@ozone.apache.org\/msg00612.html\">\u7db2\u5740<\/a>\u7684\u4f5c\u6cd5\uff0c\u5617\u8a66\u66f4\u65b0 conf (dfs.checksum.type) \u6210 SHA256\uff0c\u9810\u8a2d\u662f CRC32C\uff0c\u4f46\u662f\u9084\u662f\u7121\u6cd5\u7522\u751f SHA256 \u7684\u6aa2\u67e5\u78bc\u3002<\/p>\n<h4><a href=\"https:\/\/cloud.google.com\/architecture\/hadoop\/validating-data-transfers\">GCP \u600e\u9ebc\u505a\uff1f<\/a><\/h4>\n<pre class=\"lang:bash\">hadoop fs -Ddfs.checksum.combine.mode=COMPOSITE_CRC -checksum hdfs:\/\/\/user\/bob\/data.bin<\/pre>\n<p>GCP \u53ef\u4ee5\u7528\u4ee5\u4e0a\u7684\u6307\u4ee4\u76f4\u63a5\u53d6\u5f97 checksum \u4f46\u662f\u4e3b\u8981\u9084\u662f CRC32 \u8ddf MD5\uff0c<a href=\"https:\/\/hadoop.apache.org\/docs\/stable\/hadoop-azure\/abfs.html\">\u5099\u8a3b\uff1aabfss \u76ee\u524d\u9084\u4e0d\u652f\u63f4 -checksum \u9019\u500b argument\u3002<\/a><\/p>\n<h3>Limitations of the ABFS connector<\/h3>\n<ul>\n<li>File last access time is not tracked.<\/li>\n<li>Extended attributes are not supported.<\/li>\n<li>File Checksums are not supported.<\/li>\n<li>The\u00a0<tt>Syncable<\/tt>\u00a0interfaces\u00a0<tt>hsync()<\/tt>\u00a0and\u00a0<tt>hflush()<\/tt>\u00a0operations are supported if\u00a0<tt>fs.azure.enable.flush<\/tt>\u00a0is set to true (default=true). With the Wasb connector, this limited the number of times either call could be made to 50,000\u00a0<a class=\"externalLink\" href=\"https:\/\/issues.apache.org\/jira\/browse\/HADOOP-15478\">HADOOP-15478<\/a>. If abfs has the a similar limit, then excessive use of sync\/flush may cause problems.<\/li>\n<\/ul>\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f7f\u7528 Spark\/Hadoop \u751f\u614b\u7cfb\u9019\u9ebc\u4e45\u4e4b\u5f8c\uff0c\u6700\u8fd1\u624d\u958b\u59cb\u4f86\u7814\u7a76 Hadoop \u7684 checksum \u6a5f\u5236\u662f\u600e\u9ebc\u904b\u4f5c\u7684\uff1f<\/p>\n","protected":false},"author":1,"featured_media":8138,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,14],"tags":[1401,1402,266,1405,1403,1406],"class_list":["post-8120","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bigdata-ml","category-it-technology","tag-checksum","tag-crc32c","tag-hdfs","tag-md5","tag-md5md5crc32castagnolifilechecksum","tag-sha256"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Hadoop] Hdfs Data Integrity with Checksum - 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